Panic in Go net Dial and LookupPort on Windows with NUL-byte input
CVE-2026-39836 affects Go's net package on Windows. The Dial and LookupPort functions would panic when provided input containing a NUL (0) byte instead of handling the condition safely. The issue is specific to Windows input handling in these APIs. The fix changes the affected functions to return an error rather than panicking when NUL-byte input is supplied.
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Impact, mitigation & remediation
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
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The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.